Dark energy and dark matter together constitute 95% of the cosmic energy budget yet remain unexplained. This paper proposes that both originate in the observer's causal diamond, grounded in the principles that information is physical and spacetime geometry may emerge from the thermodynamics of quantum information. The derivation extends a quantum recording architecture recently developed for large-scale cosmic anomalies. A central result, termed 'vacuum silence', is that the recording process is blind to its own reference state. Jacobson's entanglement equilibrium, applied to the recorded posterior rather than the bare quantum field, yields a vacuum-free Einstein equation. Each recording carries two exactly separable costs, being the quantum content of the recorded event, and the irreversible information cost of its registration. Both are proposed as gravitational sources. The first retains quantum numbers and is identified with baryonic matter. The second, termed the 'bit-weight', is a thermodynamic cost that gravitates but carries no quantum numbers, providing a collisionless, electromagnetically dark matter candidate. The cosmological constant, absent from the recorded source, returns as a geometric integration constant conjectured to satisfy an aperture relation fixed by the configuration-space geometry of causal diamonds. Under stated closure assumptions, the architecture yields c/b5. 40 from the five-component gravitational tidal sector of the recording boundary (0. 2 from Planck 2018), and the conjectured aperture relation yields _=0. 6753 (1. 3 from Planck). With both parameters fixed and the architecture's previously derived low-multipole filter applied, a joint test against Planck 2018 reproduces the six-parameter CDM fit at ²=+1. 2 (BIC = -14. 0). Falsifiable predictions include w=-1 exactly, a permanent null in direct-detection experiments, and zero primordial compensated isocurvature. This is an initial framework; open questions and limitations are highlighted for ongoing development.
Gregory O’Grady (Sun,) studied this question.